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NET attributes for D FO child class constructors Previously, we used to define class constructors like below if we want to switch correct child class via a parameter: The constructor template given above is declared in the base class and child classes does not have any information on them about which table they are constructed from, which makes it not very readable.
It is possible to extended those old style constructs using method posthandlers but if a couple of different extensions extend the same method, things get a little bit messy.
For all that reasons, class attributes are the new way to define child class constructors and widely being used in newer D FO code.
Let create an example to understand it further. To be able to use attributes in class constructors, you need to define your attribute class first. Set singleton false if you do want to use an instance per parameter in our case yes.
Another thing you can spot here is the usage of TableName instead of tableId directly. At the time of writing, in the attribute declaration, you can only use metadata assertion functions like tableStrclassStr and you cannot use the compile-time tableNum function.
I have created following classes to test an attribute based child class construction. It simply constructs a child class per table Customer or Vendor and returns their name from the parmName method to test. After we implement attributes on our child classes, our construct is now changed to benefit from the SysExtensionAppClassFactory:: If we want to add another child class to AtTest class, we just create another child class and set the correct attribute on top of its declaration.
One drawback is, at the time of writing, you cannot pass parameters to the new method of the class if you construct it from the getClassFromSysAttribute method.
So your older classes may need some re-construction as we did in our example here.
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